Flexible staybolt connection for boilers



C. HYLAND.

FLEXIBLE STNYBOLT CONNECTION FOR BOILERS. APPLICATION FILED JAN-7.1916.

1 ,3 1 9,772. .Patented Oct. 28, 1919.

A florne'y IV/TNESSESI I I INVENTOR W 4 W a UNITED STA ES PATENT OFFICE.

CHARLES I-IYLAND, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO FLANNERY BOLT COMPANY, OF PITTSBURGH, PENNSYLVANIA.

FLEXIBLE STAYBOLT CONNECTION FOR BOILERS.

Specification of Letters Patent.

Patented Oct. 28, 1919.

Application filed January 7, 1916. Shrial No. 70,842.

To all whom it may concern:

Be it known that I, CHARLES HYLANn, a citizen of the United States, and a res1- dent of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Flexible Staybolt Connections for Boilers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in stay bolt connection for boilers.

In an application for patent filed by B. E. D. Stafford and F. K. Landgraf November 6th, 1915, Serial Number 60,051, the roof sheet is provided with a depressed concave seat around each bolt opening, to form a seat for the bolt head, and a sleeve or housing is welded to the roof plate around the bolt opening therein, the outer end of the sleeve or housing being closed by a removable screw cap.

This invention consists in a roof plate having an opening for the passage of a bolt and a depressed concave seat around said opening to form a. seat for the bolt head, and a cap welded to the plate and forming a permanent closure for the bolt opening and a cover for the bolt.

In the accompanying drawing, Figure l is a view partly in section and partly in elevation of my improvement, and Fig. 2 is a view in section showing the method of forming the depressed seats.

1 represents a roof plate or sheet of a locomotive boiler provided with an opening 2 for each stay bolt, the said opening being slightly larger than the shank 3 of the bolt, so as to permit of the necessary lateral movement of the bolt in the opening. The plate 1 is pressed inwardly at each bolt opening as at 4, and the depressed portion is provided on its outer face with a curved seat 5 for the head 6 of the bolt. The head of the bolt therefore rests directly against the outer face of the outer plate of the boiler, and as the seat for the head is depressed, the head need project but slightly, if any, beyond the plane of the outer face of the plate 1.

After the bolt has been placed in position, it is permanently secured in place by the imperforate cap 7, preferably of concavo-convex shape, welded at its periphery to the plate 1. The outer edge of the cap 7 preferably rests within the outer end of the depressed seat as shown in Fig. 1, so that the weld will be located to a large extent below the plane of the outer face of plate 1.

The head 6 of the bolt may be more or less flattened, and when so shaped the cap 7 may be shaped so as to provide for simply the necessary clearance between the parts.

In constructing the seat, the plate is placed between a die 8 and punch 9 as shown in Fig. 2, which shape the seat and punch a small opening through the plate in line with the center of the punch. The plate 1 is then removed fromthe die and the hole enlarged and shaped by a suitable boring or reaming tool, the small hole punched by the die, operating to receive a teat on the boring or reaming tool for steadying the same while cutting the larger opening.

After the bolt has been properly secured to the inner sheet in any of the usual and well known ways, the cap 7 is placed in position and permanently secured by welding by the oxy-acetylene or electrical processes of welding. This cap covers and conceals the head of the bolt and forms an abutment for the same when the bolt is under collapsing stresses, while the plate itself supports the head and sustains all stresses due to boiler pressure.

, By forcing or punching the boiler sheet inwardly on the water space side for supporting the staybolt, the convex surface readily dispels the solid matter, and thus enables the stay bolt to move with the fire box when expanding, unrestricted by reason of incrustation. Again by making the cap weld to the outer sheet, I restore the sheet to approximately its full strength by unit ing the surfaces surrounding the bolt hole, thus conserving the plate strength espe cially over the roof sheet and in the coinbustion chamber, and rendering the same stronger to the load due to pressure, should the staybolt break.

Having fully described my invention what I claimas new and desire to secure by Letters-Patent, is

In a stay bolt construction, the combination of a boiler seat for the bolt head, the said seat being plate having a depressed formed by pressing the plate inwardly, a In testimony whereof, I have signed this bolt the shank of which passes through an specification 1n the presence of two sub in opening formed at the bottom of said describing Witnesses.

pressed seat, and an imperforate arched cup having a continuous edge abutting the CHARLES HYLAND' plate Within the depression and adjacent WVitnesses: the outer edge of the latter and Welded EDWIN S. Ryan, to the said plate. F. H. ALLISON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

